"Simply because you don't like someone doesn't give you the right as the sitting president to do something like this. ... This was about trying to gain an advantage for his side, this case [Hillary] Clinton," he said.

Shaffer also said Trump must have sufficient evidence since he went public with the accusations on Twitter.

Former U.S. attorney and Fox News contributor Andy McCarthy said it’s “ridiculous” that some Democrats are complaining about Attorney General William Barr’s review of the origins of the Russia investigation.